Water Quality
Water Quality > Tributary and Waterfront Data > Pocantico River > Sleepy Hollow Cemetery

Sleepy Hollow Cemetery

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Physical/Chemical Data

Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.

Entero Count (fecal indicator) and Rainfall

68 Samples taken

Sample Date [i] Enterococcus Count
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Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

Quality Rain, day of (in) Prior Day 2 Days Prior 3 Days Prior Rain 4 Days Total Rain
Sort Sort Sort Sort Sort Sort Sort Sort
10/19/2023 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/21/2023 158 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2023 371 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2023 371 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/27/2023 2181 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/15/2023 >2420 Beach Advisory 0.0 0.6 0.0 0.1 0.7
05/18/2023 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/20/2022 373 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/15/2022 695 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/18/2022 393 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2022 1664 Beach Advisory 0.0 0.3 0.0 0.0 0.3
06/09/2022 >24196 Beach Advisory 1.0 0.1 0.0 0.0 1.1
05/12/2022 41 Acceptable 0.0 0.0 0.0 0.0 0.0
10/21/2021 166 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/23/2021 2382 Beach Advisory 0.0 0.0 0.0 0.0 0.1
08/19/2021 >24196 Beach Advisory 0.8 0.0 0.0 0.0 0.8
07/15/2021 3076 Beach Advisory 0.0 0.0 0.0 0.2 0.2
06/17/2021 86 Beach Advisory 0.0 0.0 0.0 0.1 0.1
05/20/2021 10 Acceptable 0.0 0.0 0.0 0.2 0.2
09/21/2019 195 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/17/2019 >24196 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2019 414 Beach Advisory 0.0 0.0 0.3 1.1 1.4
06/15/2019 73 Beach Advisory 0.0 0.0 0.7 0.0 0.7
05/18/2019 10 Acceptable 0.0 0.0 0.0 0.0 0.1
10/27/2018 345 Beach Advisory 0.3 0.0 0.0 0.0 0.3
09/15/2018 332 Beach Advisory 0.0 0.0 0.0 1.1 1.1
08/18/2018 17329 Beach Advisory 0.5 1.4 0.0 0.0 1.9
06/16/2018 921 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/19/2018 613 Beach Advisory 0.3 0.0 0.3 0.9 1.4
10/21/2017 158 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/16/2017 2420 Beach Advisory 0.0 0.0 0.4 0.0 0.4
08/19/2017 1414 Beach Advisory 0.0 0.4 0.0 0.0 0.4
07/15/2017 2420 Beach Advisory 0.0 0.5 0.4 0.0 0.8
06/17/2017 689 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/20/2017 64 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/08/2016 >2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/10/2016 549 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2016 >2420 Beach Advisory 0.0 0.4 0.0 0.3 0.7
07/09/2016 727 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/11/2016 1733 Beach Advisory 0.0 0.0 0.0 0.3 0.3
05/14/2016 26 Acceptable 0.0 0.2 0.0 0.0 0.2
10/03/2015 >2420 Beach Advisory 0.4 0.5 0.1 1.3 2.2
09/05/2015 24 Acceptable 0.0 0.0 0.0 0.0 0.0
08/01/2015 111 Beach Advisory 0.0 0.7 0.0 0.0 0.7
07/04/2015 184 Beach Advisory 0.0 0.0 0.0 0.6 0.6
06/06/2015 980 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/02/2015 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/04/2014 >2420 Beach Advisory 0.8 0.0 0.0 0.0 0.8
09/06/2014 461 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/02/2014 >2420 Beach Advisory 0.2 0.2 0.0 0.0 0.4
07/05/2014 1414 Beach Advisory 0.0 0.1 1.4 1.5 3.0
06/07/2014 70 Beach Advisory 0.0 0.0 0.5 0.2 0.6
05/03/2014 126 Beach Advisory 0.0 0.0 0.3 1.4 1.7
10/12/2013 101 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/14/2013 579 Beach Advisory 0.0 0.1 1.7 0.0 1.8
08/10/2013 2420 Beach Advisory 0.0 0.3 0.1 0.0 0.4
07/13/2013 1203 Beach Advisory 0.0 0.1 0.0 0.2 0.4
06/15/2013 461 Beach Advisory 0.0 0.3 0.7 0.0 1.0
05/04/2013 21 Acceptable 0.0 0.0 0.0 0.0 0.0
10/06/2012 >2420 Beach Advisory 0.0 0.0 1.2 0.3 1.5
09/08/2012 238 Beach Advisory 1.5 0.0 0.0 0.5 2.0
08/04/2012 184 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/14/2012 345 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/02/2012 >2420 Beach Advisory 0.9 0.0 0.0 0.0 1.0
05/12/2012 155 Beach Advisory 0.0 0.0 0.3 0.7 1.0
11/06/2011 59 Acceptable 0.0 0.0 0.0 0.0 0.0
11/04/2010 >2420 Beach Advisory 1.1 0.0 0.0 0.0 1.1
06/12/2010 687 Beach Advisory 0.0 0.0 0.0 0.1 0.1

Entero Count (fecal indicator) and Rainfall Correlation

68 Samples taken

Water Quality*

Acceptable (0–60) Beach Advisory (61+)

*Single sample thresholds;
Enterococcus count per 100mL

Prior Four Day Rainfall
(in inches)

Dry Weather (0–0.25) Wet Weather (0.25+)

Enterococcus is an EPA-approved fecal contamination indicator.

Samples taken by citizen scientists trained by Riverkeeper, and processed on the Riverkeeper vessel, according to the 2014 Quality Assurance Project Plan.

Rainfall data comes from wunderground.com. Wet weather is a common trigger of fecal contamination.

What do the Numbers Mean?

Water Quality scoring is based on the 2012 Recreational Water Quality Criteria from the US Environmental Protection Agency (EPA) for safe swimming. Learn More

About this location:

This site is located at the downstream end of the Sleepy Hollow Cemetery, near Route 9. Upstream of this site, the river flows through a forested buffer that is bounded by the lawns of the cemetery to the west and Douglas Park to the east.

Agencies Responsible:

Westchester County Dept. of Health: 914-813-5000; NYSDEC Region 3: 914-428-2505

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